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NITED STATES 1 PATENT .OFFICE.

WILLIAM H. GUILD, OF BROOKLYN, NEl/V YORK, ASSIGNOR TO GUILD &

GARRISON, OF SAME PLACE.

ga M SPECIFICATION forming part of Letters Patent No. 276,805, dated May1, 1883.

Application filed February 21,1883. (No model.)

of Brooklyn, in thecounty of Kings and State of New York, have inventeda new and useful Improvement in Pump-Valves, of which the following is aspecification.

My invention is applicable to pneumatic and hydraulic pumps, includingair-compressors, and relates to valves which. are assisted in closing bymeans of coiled-wire springs of conical form, which are placed on thevalvestems and have a bearing on the back of the valves. In such springsthe lower end coil of largest diameter has sometimes been secured bysoldering to the next inner coil; but the solder in time is apt tocorrode away and release the end of the wire. To avoid soldering, theterminal portion of the outer coil has been turned inward and carriedunder the inner coils of smaller diameter to the stem, and bent aroundthe stem to secure it; but this latter construction is objectionable,because the turned-in end portion of the wire and the coils resting uponit are worn away by the abrasion between them, and weakened or finallycut in two. The spring which I employ belongs to the class last abovedescribed; and the object of my invention is to prevent. the abrasionand cutting away of the turned-in portion of the wire and the coilsunder which "such turned-in portion passes.

To this end my invention consists in arching or bowing upward the lowercoils of the spring at the points where the turned-in portion intersectsthem, so that the said coils will have a' bearing on the valve on eachside of the turnedin and intersecting portion, and will be held out ofcontact with said turned-in portion, as hereinafter more fullydescribed.

In the accompanying drawings, Figure 1 represents a side view of aspring embodying my invention and a valve to which the spring isapplied; and Fig. 2 represents atransverse section through the stem, anda plan of the spring and valve.

Similar letters of reference designate corresponding parts in bothfigures.

A designates a valve-seat, here shown as provided with an external screwthread, whereby it may be secured in place; and B designates a diskvalve of ordinary form, which is adapted to play up and down on thefixed stem 0. The valve ,is aided in closing by a coiled-wire spring, D,of conical form, applied between the valve and the head of the stem 0.The wire at the upper and smaller end of the'spring D is formed into aneye, a, through which the stem passes, and the lower end portion, 1), ofthe wire, after forming the lower and outermost coil, 0, is turnedinward and passes under all the other coils of the spring to the stem,and is formed with an eye, a, to fit the stem. The two ends of the wireare therefore secured without solder to the stem 0. a.

So far asdescribed the spring does not differ from those before made 5but such springs have heretofore been objectionable, because one or moreof the inner coils, c, of smaller diameter, have rested upon theturned-in portion b of the wire at their points of intersection 0 Toobviate this objection I arch or bow upward the one or more coils c at 0so that. they pass over the turned-in portion 1) of the wire withouttouching it, as best shown in Fig. l. The coils c then have a bearing onthe valve throughout their circumference, and on opposite sides of andclose to the turned-in portion 1), and in the action of the spring thereis no abrasion between the coils c and portion 1), and consequently nocutting away of either part. i

I have chosen for the purpose of illustration a very common form ofvalve 5; but of course my invention is applicable to valves of otherforms-as, for example, valves having their upper surfaces or backsslightly conical instead of flat.

What I claim as my invention, and desire to secure by Letters Patent,is--- 1. The combination, with a valve and its stem, of the coiledspring having the terminal portions of its outer coil turned inwardunder the coils to the stem, and having one or more of its coils archedor bowed upward at their intersection with said turned-in portion, so asto prevent abrasion between said coil or coils as to cross saidturned-in portion without and said turned-in portion, and allow the saidtouching it, substantially as and for the pur- :o coil or coils to bearon the valve throughout pose herein described. 1 their entirecircumference, substantially as v herein described. GUILD 2. The springfor a pump-valve, having the Witnesses: turned-in portion b, and havingone or more FREDK. HAYNES,

of its coils arched or bent upward, as at 0 so ED. L. MORAN.

